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Service Guide ML393/ML393CPlus
Chapter 4 Failure Analysis
RAP 10C: Serial Interface Problem
START
Correctly set the interface menu parameters.
1. Baud rate.
2. Character format.
3. Protocol.
4. Busy signal polarity.
Has the problem been resolved?
YES End of procedure.
NO Are +/-8 vdc outputs provided on the control board?
Check at both ends of C9 for the positive voltage.
Check at both ends of C8 for the negative voltage.
NO Replace the power supply unit.
YES Refer to RAP 10B.
Has the problem been resolved?
YES End of procedure.
NO Replace the power supply board.
Has the problem been resolved?
YES End of procedure.
NO Perform the procedures listed below.
1. Replace the interface connector board.
2. Replace the cable connected to CN6 on the control board.
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